Optimal Design of Solar Aided Coal-fired Electricity Generation System

摘要

In order to overcome deterioration of heat transfer caused by two-phase flow and avoid flow separation, using volume expanding evaporator instead of steam-water separator to make integration and optimization between parabolic trough solar energy collection system and coal-fired power plant regenerative heating system. Then based on equivalent enthalpy drop method, it analyses the thermal economy about 300 MW coal-fired unit to discuss the optimal integration solutions and works out the unit thermal economy variation tendency and the best back water position of the drain in volume expanding evaporator when the different stage extraction steam of coal-fired unit replaced by the exit steam of solar collection system super heater region. The results show that the whole third stage extraction steam replaced by solar heat and drain water in volume expanding evaporator returned back to 3 heater exit of coal-fired unit feedwater pipeline is the best scheme.